unable to open /dev/mixer

[Graham Ashton <graham@mirror.bt.co.uk>]

I've just got sound going under 2.2.3, SoundBlaster 64 [OEM] (how happy
am I?!!)

My little mixer controller complained that it couldn't access
/dev/mixer, the permissions on which were 660. It's owned root,audio. I
put myself in the audio group, but it didn't fix it. If I do "newgrp
audio" I'm asked for a password.

What am I missing? I get the impression it's a real easy one, but I just
can't work it out.

For a short term fix I just did "chmod o+rw /dev/mixer", but I'd like to
do it properly.

Thanks.

-- 
Graham